R is released under the ‘GNU Public License’: see
license for details. The license describes your right
to use R. Copyright is concerned with ownership of intellectual
rights, and some of the software used has conditions that the
copyright must be explicitly stated: see the ‘Details’ section. We
are grateful to these people and other contributors (see
contributors) for the ability to use their work.
The file ‘R_HOME/COPYRIGHTS’ lists the copyrights in full detail.